October 2020 in “Journal of Pharmaceutical Sciences” Topical finasteride with EGCG or TA improves drug release and dermal uptake, potentially treating hair loss effectively.
July 2008 in “British Journal of Dermatology” Cyclosporin doesn't stop hair loss.
8 citations
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February 1968 in “Australian Journal of Zoology” The southern elephant seal's skin layer helps waterproof the skin by being tightly connected to hair shafts.
January 1981 in “Purdue e-Pubs (Purdue University)” Pig skin is similar to human skin, with no major changes as they age.
106 citations
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June 1990 in “Journal of Investigative Dermatology” 7 citations
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March 1986 in “British Veterinary Journal” Canine skin has two main layers: the epidermis and dermis, with a supportive subcutis layer.
36 citations
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January 1994 in “Cell and Tissue Research” 59 citations
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August 1981 in “PubMed” Trichilemmal keratinization is a unique process in hair follicles where the outer root sheath turns into keratin without a specific layer.
February 2022 in “Cosmetic Dermatology” Healthy skin prevents water loss and protects against threats.
August 2019 in “Journal of Investigative Dermatology” The study found that tight junctions reach the top layer of the skin's stratum granulosum, not just the second top layer as previously thought.
63 citations
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November 2009 in “British journal of dermatology/British journal of dermatology, Supplement” Sub3 is essential for fungus adherence but not for skin invasion.
17 citations
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May 1969 in “American Journal of Physical Anthropology” The silver marmoset's skin is thin, lacks pigment cells, and has unique features like keratinized spines and specialized glands.
17 citations
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August 2014 in “The Anatomical Record” Scaffoldin helps form hard skin structures in chicken embryos.
23 citations
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December 1977 in “Virchows Archiv B Cell Pathology” 8 citations
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July 2004 in “Journal of morphology” Marsupial hair structure and keratin distribution are similar to placental mammals.
6 citations
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December 2018 in “International Journal of Cosmetic Science” CARB is a strong barrier in human hair that prevents dye penetration.
June 2019 in “PRISM (University of Calgary)” DPCs and new biomaterials can greatly improve skin healing.
July 2025 in “Bioma Berkala Ilmiah Biologi” Wild boar skin from Timor Island has three layers with various structures like hair follicles and glands.
February 2019 in “American International Journal of Humanities Arts and Social Sciences” The dermis of Millivora Capenesis has two layers with various connective tissues, blood vessels, glands, and sensory structures.
103 citations
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December 1986 in “Journal of Investigative Dermatology” 31 citations
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September 1996 in “Differentiation” The upper dermal sheath can regenerate hair in rats.
January 2024 in “Toxicologic Pathology” The skin protects the body, helps heal wounds, stores energy, and supports health.
218 citations
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May 2014 in “Experimental Dermatology” Skin fat cells help with skin balance, hair growth, and healing wounds.
January 1995 in “Skin Cancer” The outer root sheath in hair follicles changes during growth, with different keratinization processes in its layers.
January 2020 in “프로그램북(구 초록집)” The skin has two main layers, the epidermis and dermis, which work together and are essential for diagnosing skin conditions.
1 citations
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January 2025 in “Advances in Wound Care” Dermal sheath cells help heal wounds by showing both skin and connective tissue traits.
December 2004 in “Differentiation” August 1993 in “Journal of Dermatological Science” 
November 2022 in “PubMed” Deep dermal tissue dislocation injury in pigs leads to thicker fibrotic tissue and increased type III collagen, affecting skin repair.
10 citations
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November 2016 in “International Journal of Cosmetic Science” A tough membrane between the outer and inner layers of human hair protects it from damage.